제출 #636268

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
636268		jame0313	Untitled (POI11_rot)	C++17	27 / 100	103 ms	65536 KiB

Main

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
using ld = long double;
using pll = pair<ll, ll>;
// and so on
int arr[1000001];
int in[1000001];
int out[1000001];
vector<vector<int> > mp;
vector<int> lst[2000001];
int id = -1;
int fnd(int idx, int v){
    return upper_bound(lst[idx].begin(),lst[idx].end(),v) - lst[idx].begin();
}
int parse(int x){
    int c;
    cin>>c;
    in[x] = x;
    if(c==0){
        int l = parse(++id);
        int r = parse(++id);
        mp[x].push_back(l);
        mp[x].push_back(r);
    }
    else{
        arr[x] = c;
    }
    out[x] = id;
    return in[x];
}
ll sol(int x) {
    ll ret = 0;
    if (arr[x] == 0) {
        int a = mp[x][0];
        int b = mp[x][1];
        ret += sol(a) + sol(b);
        if(out[a] - in[a] < out[b] - in[b]) swap(a, b);
        ll acnt = 0, bcnt = 0;
        int zero_cnt = fnd(a, 0);
        int siz = lst[a].size();
        for(int i=in[b];i<=out[b];i++){
            if(!arr[i]) continue;
            int cnt = fnd(a,arr[i]) - zero_cnt;
            acnt += cnt;
            bcnt += siz - cnt;
        }
        ret += min(acnt, bcnt);
        lst[x] = lst[a];
        lst[x].insert(lst[x].end(),lst[b].begin(),lst[b].end());
        sort(lst[x].begin(),lst[x].end());
        lst[a].clear();
        lst[b].clear();
        return ret;

    } else {
        lst[x] = {arr[x]};
        return 0;
    }
}
int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int N;
    cin >> N;
    mp.resize(2*N+1);
    int r = parse(++id);
    cout<<sol(r);
    
}

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